TikZ and PGF builds

PGF has a relatively long release cycle.
To get all the latest features and bug-fixes you should use the development version of PGF.
If you don't want to check out PGF from CVS yourself
you can find builds here, conveniently packed in a TeX Directory Structure (TDS)
compliant structure.

Warning: The development versions are not always stable. If the latest build causes problems,
download and install an earlier build and wait for a bug fix.

Introduced a new class model for graph drawing (Digraph,
Arc, and Vertex instead of Graph, Edge, Node). I'm currently
porting all the old code, but it takes a while and it's a
bit messy right now. Some easy algorithms are already based
on the new system, old ones not. In the end, things should
be significantly faster and also easier to program.